1. Chomsky, A.N.: Formal properties of grammars. Handbook of Math. Psych. 2, 323–418 (1963)
2. Knuth, D.E.: Semantics of Context-Free Languages. Mathematical Systems Theory 2(2), 127–145 (1968)
3. Aho, A.V., Sethi, R., Ullman, J.D.: Compilers: Principles, Techniques and Tools. Addison-Wesley, Reading (1986)
4. Grune, D., et al.: Modern Compiler Design. John Wiley & Sons, Chichester (2000)
5. ONeill, M., Conor, R.: Grammatical Evolution. Kluwer Academic Publishers, Dordrecht (2003)